I have not been able to purchase any new RB3 content in a while. even though I won some codes I could not spend the money in RB3. every time i try to do something new in the store (look at a song, change the sorting, play a preview) i get booted back out to the main menu. I ended up spending the money I won from the contests on Beatles Rock Band. that store only kicked me out twice.
BTW I play on PS3